Nginx and Unicorn: how are they connected to each other?

Posted August 8, 2013 3k views
I just got VM which had nginx, unicorn and a fresh rails app installed. I looked at the nginx config file, and I do not understand how it connects to unicorn, especially since there doesn't seem to be any upstream setting (which is what most tutorial's say you need). Also there seems to be a line in the default site-enabled config file that has the line: proxy_pass http://app_server; I am not sure where is app_server defined. Is this an upstream defined somewhere? Note: This post has screenshots on how all my current configuration files look like:

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